56731721147042 has 6 divisors (see below), whose sum is σ = 85097597698449. Its totient is φ = 28365855247560.

The previous prime is 56731721146979. The next prime is 56731721147111. The reversal of 56731721147042 is 24074112713765.

It can be written as a sum of positive squares in 2 ways, for example, as 41783283072001 + 14948438075041 = 6463999^2 + 3866321^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=5325961.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7988942 + ... + 13314902.

Almost surely, 2^{56731721147042} is an apocalyptic number.

56731721147042 is a deficient number, since it is larger than the sum of its proper divisors (28365876551407).

56731721147042 is an frugal number, since it uses more digits than its factorization.

56731721147042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10651924 (or 5325963 counting only the distinct ones).

The product of its (nonzero) digits is 1975680, while the sum is 50.

The spelling of 56731721147042 in words is "fifty-six trillion, seven hundred thirty-one billion, seven hundred twenty-one million, one hundred forty-seven thousand, forty-two".